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Stock-based Compensation - Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Stock-based compensation expense        
Stock-based compensation expense $ 10,973 $ 7,944 $ 22,223 $ 15,421
Research and development        
Stock-based compensation expense        
Stock-based compensation expense 5,184 3,301 10,570 6,488
General and administrative        
Stock-based compensation expense        
Stock-based compensation expense 5,789 4,643 11,653 8,933
Stock options        
Stock-based compensation expense        
Stock-based compensation expense 7,431 7,944 16,029 15,421
Restricted Stock Units (RSUs)        
Stock-based compensation expense        
Stock-based compensation expense $ 3,542 $ 0 $ 6,194 $ 0